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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Synthesis by a chemical method and characterization of CaZrO3 powders: Potential application as humidity sensors

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Author(s):
Andre, R. S. [1] ; Zanetti, S. M. [2] ; Varela, J. A. [2] ; Longo, E. [2]
Total Authors: 4
Affiliation:
[1] Univ Fed S Carlos, DQ, LIEC CMDMC, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Estadual Paulista, IQ, LIEC INCT, BR-14801907 Araraquara, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 40, n. 10, B, p. 16627-16634, DEC 2014.
Web of Science Citations: 18
Abstract

CaZrO3 stoichiometric and non-stoichiometric (CaO- and ZrO2-excess) powders were synthesized by a chemical method which is based on polymeric precursors. The mesoporous material was characterized using X-ray diffraction (XRD), Raman spectrometry, field emission gun scanning electron microscopy (FE-SEM) and N-2 adsorption-desorption measurements. The humidity sensing properties were evaluated by using an inductance, capacitance and resistance analyzer. The results revealed that all samples responded well to the humidity by showing a change in resistance values; however, hysteresis mean values in the 25-70% relative humidity (RH) range were higher than that of 5%. The CaO-excess sample sensitivity calculated in the 10-85% RH range was 3261. Complex impedance measurements indicated that the improved sample sensitivities can be attributed to their mesoporous structure along with hetero-junctions formed by second phases. Sample resistances varied by about three orders of magnitude in the RH range. These results demonstrate the great potential of CZO samples for use in the development of new humidity sensors. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
Grantee:Elson Longo da Silva
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC